<template>
  <div class="login_container">
      <div class="login_box">
          <!-- 头像区域 -->
          <div class="avatar_box">
              <img src="../assets/logo.png" alt="">
          </div>
          <!-- 登录表单区域 -->
         <el-form label-width="0" :model="form" class="login_form" :rules="rules" ref='loginFormRef'>
             <!-- 用户名 -->
            <el-form-item prop='username'>
                <el-input prefix-icon="el-icon-user-solid" v-model="form.username"></el-input>
            </el-form-item>
            <!-- 密码 -->
            <el-form-item prop='password'>
                <el-input prefix-icon="el-icon-search" v-model="form.password" type='password'></el-input>
            </el-form-item>
            <!-- 按钮区 -->
            <el-form-item class="btns">
                <el-button type="primary" @click="login">登录</el-button>
                <el-button type="info" @click="resetLoginForm">重置</el-button>
            </el-form-item>
         </el-form> 
      </div>
  </div>
</template>

<script>
export default {
    name:'Login',
    data() {
        return {
            form:{
                username:'admin',
                password:'123456'
            },
            rules:{
            username: [
            { required: true, message: '请输入登录名称', trigger: 'blur' },
            { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
            ],
            password: [
               { required: true, message: '请输入密码', trigger: 'blur' },
            { min: 6, max: 10, message: '长度在 6 到 15 个字符', trigger: 'blur' }
            ],
            }
        }
    },
    methods: {
        // 点击重置按钮,重置登录表单
       resetLoginForm(){
           this.$refs.loginFormRef.resetFields();
       },
       login(){
           this.$refs.loginFormRef.validate(async(valid)=>{
               if(!valid) return;
              const {data:res}= await this.$http.post('login',this.form)
              if(res.meta.status!==200) return this.$message.error("登录失败");
              this.$message.success("登录成功");
            //   1.将登陆成功之后的token，保存到客户端的session Storage中
                // 1.1 项目中除了登录之外的其他api接口，必须在登录之后才能访问
                // 1.2 token只应在当前网站打开期间生效，所以将token保存在session Storage中
                // 2. 通过编辑式导航跳转到后台主页，路由地址是/home
               console.log(res)
               window.sessionStorage.setItem('token',res.data.token);
                this.$router.push('/home')
           })
       }
    },
}
</script>

<style lang="less" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}
.login_box{
    width: 450px;
    height: 350px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);

    .avatar_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
        img{
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
.btns{
    display: flex;
    justify-content: flex-end;
}
</style>